Jump to main content
Jump to site search

Issue 34, 2018
Previous Article Next Article

3-D manipulation of a single nano-droplet on graphene with an electrowetting driving scheme: critical condition and tunability

Author affiliations

Abstract

The next generation of micro/nano-fluidic systems, featuring manipulation of a single nanoliter volume of a chemical reactant or bio-substance, is greatly dependent on the accurate manipulation of a single nano-droplet. In this paper, to resolve the lack of efficient methods for 3-D actuation of nano-droplets with high tunability, we proposed an electro-wetting-on-dielectric (EWOD) driving scheme on a graphene surface. The droplet could be actuated when the EWOD-saturated contact angle was reached, which determined the critical magnitude of the E-field. The droplet velocity agreed well with the vcomE1/2C–O law due to the film-detachment mechanism, which indicated the low viscous dissipation and good tunability of the proposed technique. The droplet velocity could also be tuned by changing the initial wettability of the graphene surface. Detailed examination of the liquid–solid interface revealed significant penetration of water molecules into the inner Helmholtz plane (IHP) before the induction of droplet detachment when the electric energy was converted into surface energy. For all the studied cases, the saturated contact angle served as a sufficient condition for the actuation of droplets.

Graphical abstract: 3-D manipulation of a single nano-droplet on graphene with an electrowetting driving scheme: critical condition and tunability

Back to tab navigation

Supplementary files

Publication details

The article was received on 23 Apr 2018, accepted on 30 Jul 2018 and first published on 30 Jul 2018


Article type: Paper
DOI: 10.1039/C8NR03330G
Citation: Nanoscale, 2018,10, 16079-16086
  •   Request permissions

    3-D manipulation of a single nano-droplet on graphene with an electrowetting driving scheme: critical condition and tunability

    J. Zeng, S. Zhang, K. Tang, G. Chen, W. Yuan and Y. Tang, Nanoscale, 2018, 10, 16079
    DOI: 10.1039/C8NR03330G

Search articles by author

Spotlight

Advertisements